Azimuth Adjustment - Hitachi DR100E Service Manual

3. Azimuth Adjustment

1. Connect an electronic voltmeter to the Line Out terminal, and set Test tape MTT-
114N into the Unit.
2. Playback FWD side, and adjust the azimuth screw A so as to get maximum
indication on the voltmeter, then make the same adjustment with the screw B for
REV side.
3. Readjust if the output level difference exceeds 2dB after adjustment, and also
confirm that the phase difference in the both channels is within ± 45°.
Note: In order to prevent the backlash of the azimuth screw, end in the clockwise rotation.
4. PB Output Level Adjustment
1. Connect an electronic voltmeter to the Line Out terminal, and set Test tape MTT-150
into the Unit.
2. Playback FWD side, and adjust the RT101L (Lch) and RT101R (Rch) so that the
voltmeter indicates 400mV ± 0.5dB.
5. REC Level Adjustment
1. Set Test tape (Type 1 tape: UD-1) into the unit, input 400 Hz 94mV signal to JK1
LINE IN and record this signal on the tape.
2. Playback the recorded signal, and adjust RT102L (Lch) and RT102R (Rch) so that
the voltmeter indicates 125mV ± 0.5dB at JK1 LINE OUT.